diff --git a/core/blockchain.go b/core/blockchain.go
index 85765bb45c..63412a1e43 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -205,6 +205,20 @@ func (self *BlockChain) loadLastState() error {
 	glog.V(logger.Info).Infof("Last block: #%d [%x…] TD=%v", self.currentBlock.Number(), self.currentBlock.Hash().Bytes()[:4], blockTd)
 	glog.V(logger.Info).Infof("Fast block: #%d [%x…] TD=%v", self.currentFastBlock.Number(), self.currentFastBlock.Hash().Bytes()[:4], fastTd)
 
+	/*
+		st, err := state.New(currentHeader.Root, self.chainDb)
+		if err != nil {
+			return err
+		}
+		glog.V(logger.Info).Infoln("caching state accounts...")
+		tstart := time.Now()
+		if err := st.LoadAll(); err != nil {
+			return fmt.Errorf("core: could not pre-load account data: %v", err)
+		}
+		self.canonState = st
+		glog.V(logger.Info).Infoln("cached", len(st.StateObjects), "in", time.Since(tstart))
+	*/
+
 	return nil
 }
 
diff --git a/core/state/state.go b/core/state/state.go
index 43ecebc9fd..8ccc68dbb6 100644
--- a/core/state/state.go
+++ b/core/state/state.go
@@ -1,6 +1,7 @@
 package state
 
 import (
+	"bytes"
 	"fmt"
 	"math/big"
 
@@ -53,6 +54,19 @@ func New(root common.Hash, db ethdb.Database) (*State, error) {
 	}, nil
 }
 
+func (s *State) LoadAll() error {
+	it := s.Trie.Iterator()
+	for it.Next() {
+		addr := s.Trie.GetKey(it.Key)
+		obj, err := DecodeObjectLazily(common.BytesToAddress(addr), s.Db, it.Value)
+		if err != nil {
+			return err
+		}
+		s.StateObjects[common.BytesToAddress(addr)] = obj
+	}
+	return nil
+}
+
 func (s *State) PrepareIntermediate(txHash, blockHash common.Hash, txIdx int) {
 	if s.parent != nil {
 		s.parent.MarkedTransition = true
@@ -79,6 +93,7 @@ func (s *State) Read(address common.Address) (object *StateObject, inCache bool)
 		if stateObject.deleted {
 			return nil, false
 		}
+		s.loadStateObject(stateObject)
 		return stateObject, inCache
 	}
 
@@ -96,6 +111,20 @@ func (s *State) Read(address common.Address) (object *StateObject, inCache bool)
 	return stateObject, false
 }
 
+func (s *State) loadStateObject(stateObject *StateObject) {
+	if stateObject.trie == nil {
+		var err error
+		if stateObject.trie, err = trie.NewSecure(stateObject.root, s.Db); err != nil {
+			panic(err)
+		}
+		if !bytes.Equal(stateObject.codeHash, emptyCodeHash) {
+			if stateObject.code, err = s.Db.Get(stateObject.codeHash); err != nil {
+				panic(fmt.Sprintf("can't get code for hash %x: %v", stateObject.codeHash, err))
+			}
+		}
+	}
+}
+
 func (s *State) GetOrNewStateObject(address common.Address) *StateObject {
 	stateObject, inCache := s.Read(address)
 	if stateObject != nil {
@@ -150,6 +179,7 @@ func (s *State) CreateStateObject(address common.Address) *StateObject {
 	stateObject.SetNonce(StartingNonce)
 
 	s.StateObjects[address] = stateObject
+	s.localStateObjects[address] = true
 
 	// If it existed set the balance to the new account
 	if so != nil {
@@ -247,8 +277,15 @@ func (s *State) SetState(address common.Address, stateAddress common.Hash, value
 func (s *State) Delete(address common.Address) bool {
 	stateObject := s.GetStateObject(address)
 	if stateObject != nil {
-		stateObject.MarkForDeletion()
+		if !s.localStateObjects[address] {
+			stateObject = stateObject.Copy()
+			s.StateObjects[address] = stateObject
+			s.localStateObjects[address] = true
+		}
+
+		stateObject.remove = true
 		stateObject.balance = new(big.Int)
+		stateObject.dirty = true
 
 		return true
 	}
@@ -311,6 +348,8 @@ func (s *State) DeleteStateObject(stateObject *StateObject) {
 }
 
 func (s *State) UpdateStateObject(stateObject *StateObject) {
+	s.loadStateObject(stateObject)
+
 	addr := stateObject.Address()
 	data, err := rlp.EncodeToBytes(stateObject)
 	if err != nil {
@@ -320,7 +359,6 @@ func (s *State) UpdateStateObject(stateObject *StateObject) {
 }
 
 func (s *State) Reset(root common.Hash) error {
-	fmt.Println("reset")
 	var (
 		err error
 		tr  = s.Trie
@@ -390,20 +428,10 @@ func (s *State) Set(o *State) {
 
 // Flatten flattens the state in to a single new state, including all changes of all ancestors.
 func Flatten(s *State) *State {
-	// first commit the parent so we can overwrite changes
-	// later.
-	var flattenedState *State
-	if s.parent != nil {
-		flattenedState = Flatten(s.parent)
-	} else {
-		flattenedState = &State{
-			Db:                s.Db,
-			Trie:              s.Trie,
-			refund:            new(big.Int),
-			StateObjects:      make(map[common.Address]*StateObject),
-			ownedStateObjects: make(map[common.Address]bool),
-		}
+	if s.parent == nil {
+		return s
 	}
+	flattenedState := Flatten(s.parent)
 
 	for address, object := range s.StateObjects {
 		flattenedState.StateObjects[address] = object
@@ -425,7 +453,8 @@ func (s *State) String() string {
 func IntermediateRoot(state *State) common.Hash {
 	s := Flatten(state)
 
-	for _, stateObject := range s.StateObjects {
+	for address, _ := range s.localStateObjects {
+		stateObject := s.StateObjects[address]
 		if stateObject.dirty {
 			if stateObject.remove {
 				s.DeleteStateObject(stateObject)
diff --git a/core/state/state_object.go b/core/state/state_object.go
index a8a67d09ba..4bc70c1b43 100644
--- a/core/state/state_object.go
+++ b/core/state/state_object.go
@@ -80,7 +80,8 @@ type StateObject struct {
 	remove  bool
 	deleted bool
 	dirty   bool
-	written bool
+
+	root common.Hash
 }
 
 func NewStateObject(address common.Address, db trie.Database) *StateObject {
@@ -99,7 +100,6 @@ func NewStateObject(address common.Address, db trie.Database) *StateObject {
 func (self *StateObject) MarkForDeletion() {
 	self.remove = true
 	self.dirty = true
-	self.written = false
 
 	if glog.V(logger.Core) {
 		glog.Infof("%x: #%d %v X\n", self.Address(), self.nonce, self.balance)
@@ -140,7 +140,6 @@ func (self *StateObject) GetState(key common.Hash) common.Hash {
 func (self *StateObject) SetState(key, value common.Hash) {
 	self.storage[key] = value
 	self.dirty = true
-	self.written = false
 }
 
 // Update updates the current cached storage to the trie
@@ -160,7 +159,6 @@ func (c *StateObject) AddBalance(amount *big.Int) {
 	if glog.V(logger.Core) {
 		glog.Infof("%x: #%d %v (+ %v)\n", c.Address(), c.nonce, c.balance, amount)
 	}
-	c.written = false
 }
 
 func (c *StateObject) SubBalance(amount *big.Int) {
@@ -169,13 +167,11 @@ func (c *StateObject) SubBalance(amount *big.Int) {
 	if glog.V(logger.Core) {
 		glog.Infof("%x: #%d %v (- %v)\n", c.Address(), c.nonce, c.balance, amount)
 	}
-	c.written = false
 }
 
 func (c *StateObject) SetBalance(amount *big.Int) {
 	c.balance = amount
 	c.dirty = true
-	c.written = false
 }
 
 func (c *StateObject) St() Storage {
@@ -229,13 +225,11 @@ func (self *StateObject) SetCode(code []byte) {
 	self.code = code
 	self.codeHash = crypto.Keccak256(code)
 	self.dirty = true
-	self.written = false
 }
 
 func (self *StateObject) SetNonce(nonce uint64) {
 	self.nonce = nonce
 	self.dirty = true
-	self.written = false
 }
 
 func (self *StateObject) Nonce() uint64 {
@@ -300,3 +294,20 @@ func DecodeObject(address common.Address, db trie.Database, data []byte) (*State
 	obj.codeHash = ext.CodeHash
 	return obj, nil
 }
+
+// DecodeObjectLazily decodes an RLP-encoded state object.
+func DecodeObjectLazily(address common.Address, db trie.Database, data []byte) (*StateObject, error) {
+	var (
+		obj = &StateObject{address: address, db: db, storage: make(Storage)}
+		ext extStateObject
+		err error
+	)
+	if err = rlp.DecodeBytes(data, &ext); err != nil {
+		return nil, err
+	}
+	obj.root = ext.Root
+	obj.nonce = ext.Nonce
+	obj.balance = ext.Balance
+	obj.codeHash = ext.CodeHash
+	return obj, nil
+}
diff --git a/core/state/state_write.go b/core/state/state_write.go
index 73faf06b94..e260e101ed 100644
--- a/core/state/state_write.go
+++ b/core/state/state_write.go
@@ -33,7 +33,9 @@ func stateCommit(state *State, db trie.DatabaseWriter) (common.Hash, error) {
 			// and just mark it for deletion in the trie.
 			stateObject.deleted = true
 			state.Trie.Delete(stateObject.Address().Bytes()[:])
-		} else if !stateObject.written {
+			// Delete the object from the cache.
+			// delete(state.StateObjects, address)
+		} else {
 			// Write any contract code associated with the state object
 			if len(stateObject.code) > 0 {
 				if err := db.Put(stateObject.codeHash, stateObject.code); err != nil {
@@ -60,7 +62,6 @@ func stateCommit(state *State, db trie.DatabaseWriter) (common.Hash, error) {
 
 		}
 		stateObject.dirty = false
-		stateObject.written = true
 	}
 	return state.Trie.CommitTo(db)
 }